package gdcp.demo_4.cn;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;

public class MyAdapter extends BaseAdapter {
    private ArrayList<Student> studentArrayList;
    private Context context;
    private IOnDelListener listener;


    public MyAdapter(Context context, ArrayList<Student> studentArrayList,IOnDelListener listener) {
        this.context = context;
        this.studentArrayList = studentArrayList;
        this.listener=listener;
    }

    public void changeData(ArrayList<Student> studentArrayList){
        this.studentArrayList = studentArrayList;
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return studentArrayList.size();
    }

    @Override
    public Object getItem(int i) {
        return studentArrayList.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    int count = 0;


    @Override
    public View getView(final int i, View view, ViewGroup viewGroup) {

        Log.e("MyAdapter", "getview" + i + "count=" + count);

        // 先判断view是不是空 非空可以复用 不需要重新构建 节省内存
        if (view == null) {
            count++;
            LayoutInflater layoutInflater = LayoutInflater.from(context);
            view = layoutInflater.inflate(R.layout.my_list_item,
                    viewGroup, false);

            //使用Holder保存子组件，避免每次使用是重复find
            StuViewHolder holder = new StuViewHolder();
            holder.headImg = view.findViewById(R.id.headView);
            holder.nameView = view.findViewById(R.id.nameview);
            holder.ageView = view.findViewById(R.id.ageview);
            holder.delView = view.findViewById(R.id.delStu);

            view.setTag(holder);
        }

        Student stu = studentArrayList.get(i);

        StuViewHolder holder = (StuViewHolder) view.getTag();

        holder.headImg.setImageResource(stu.getImgid());
        holder.ageView.setText(String.valueOf(stu.getAge()));
        holder.nameView.setText(stu.getName());


        holder.delView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                listener.del(i);
            }
        });

        return view;
    }
}
